I am stalled on Atkins

For most women, including me, your weight will spike UP just before or at the beginning of that time of the month due to hormones and water retention. I don't think there's a lot you can do about it, but it goes away over the next few days. YMMV.

As for stalling, I wouldn't worry about a week-long stall. However, there are a few things you can try. You can have a fasting day, a cheat day, or eat more calories than you normally would in one day. Any of those should be enough to surprise your metabolism, especially if you tend to eat the same sorts of things every day.

But seriously maybe give your stall another week or two. On lower carb diets, some people find that their weight stops moving down, but while that's happening, they lose inches, so keep an eye on that.

Stalls are very common (even slight weight gains), and can happen for a variety of reasons. I found out a bunch of this on an Atkins-friendly site called lowcarbsite. I've even been on extended stalls myself, and there doesn't seem to be much of a strategy to handle it other than to stick with the program (and as people on that site will often point out -- stick exactly to that program, and not some other variation you make up yourself) -- counting net carbs correctly (and completely!), not overeating protein, keeping to limits on cheese, cream and artificial sweeteners, and keeping up fiber and water intake. And even then, exercise, periods, "regularity" and other things can affect whether or not you are on a stall.

Atkins himself, in his books, pointed out there is a rare percentage of people that are metabolically resistant, and he gives a suggestion of what to try next. I don't think that is recommended for the average person on the plan, though. It is a special case.